CKEditor 4 & CKEditor 5 logos
CKEditor 4 article editor screenshot
|Original author(s)||Frederico Caldeira Knabben|
|Repository||CKEditor 4 GitHub repo CKEditor 5 GitHub repo|
|Type||HTML editor, online rich-text editor|
|License||CKEditor 5: GPL and commercial. CKEditor 4: GPL, LGPL, MPL and commercial|
FCKeditor and CKEditor 3
The first version of CKEditor, under the name FCKeditor, was released in March 2003 by Frederico Caldeira Knabben, the creator of the editor and the project's Benevolent Dictator for Life. After reaching more than 3 million downloads, FCKeditor was completely reviewed and redesigned into CKEditor 3, with special attention given to performance, accessibility and a new UI.
In December 2012, CKEditor 4 was released with an Inline Editing solution, reformatted source code, enhanced DOM and CSS performance. The server-side implementations were removed.
After five years, in 2018, CKEditor 5 first stable version was introduced. With its code rewritten from scratch, CKEditor 5 has a custom data model and architecture. The editor implements Operational Transformation for the tree-structured model as well as many other mechanisms which were required to create a real-time collaborative UX.
In October 2017, CKSource launched the CKEditor Ecosystem. As of 2020 it consists of the following products:
- CKEditor 4.
- CKEditor 5 Builds and CKEditor 5 Framework.
- CKEditor Cloud Services, which support collaboration and uploading images.
- Letters, a software component which makes real-time collaborative editing possible inside any application.
- CKFinder, an image upload and management component.
- CKEditor Cloud Services, a cloud platform with editing features and real-time collaboration services.
CKEditor 4 has features found in desktop word processors such as styles formatting (bold, italic, underline, bulleted and numbered lists), tables, block quoting, web resource linking, safe undo function, image inserting, paste from Word and other common HTML formatting tools. Also CKEditor 4 has built-in spell checker functionality provided as plug-ins by WebSpellChecker LLC. By default, it is available for free with a banner ad. It checks the spelling of the text and marks all errors with a red wavy line and allows the user to choose one of the correct suggestions.
There are currently many plugins available with CKEditor 4 to serve different needs, e.g. CKFinder and Accessibility Checker (the CKSource's plugins). CKFinder is a file manager for including files and images within content created with the editors. It is compatible with both CKEditor 4 and 5 and is available under commercial license.
Accessibility Checker is available under both Open Source and commercial licenses.
Real-time collaborative editing
CKEditor 5's architecture and custom data model makes it possible to enable real-time collaborative editing.
A custom collaborative solution can be built by using the CKEditor 5 Framework components and real-time collaborative editing can be enabled by connecting to the CKEditor Cloud Services.
A ready to use, drop-in component based on CKEditor 5 (Letters) offers a complete solution for real-time collaborative writing.
CKEditor 4 is fully compatible with most internet browsers, including latest stable releases from Google Chrome, Firefox, Safari, Microsoft Edge, Opera and Internet Explorer 10 and 11. In mobile environments, it has close to full support in Safari (iOS6 +) and Chrome (Android).
CKEditor 5 is also compatible with Google Chrome, Firefox, Safari, Opera and Microsoft Edge. However, it does not support Internet Explorer 11 yet.
- CKEditor licenses page
- Kumar, Neeraj; Koutlas, Tassos; Keen, Samuel; Crompton, Edward; Kanth, Krishna; James, Rakesh; Tewari, Malabya; Madel, Kurt (2016). Drupal 8 Development: Beginner's Guide. Packt Publishing Ltd. pp. 145–159. ISBN 9781785286261. Retrieved 11 June 2019.
- Dombrowski, Quinn (2016). Drupal for Humanists. Texas A&M University Press. ISBN 9781623494735. Retrieved 11 June 2019.
- Jin, David; Lin, Sally (2011). Advances in Multimedia, Software Engineering and Computing Vol.1: Proceedings of the 2011 MESC International Conference on Multimedia, Software Engineering and Computing, November 26-27, Wuhan, China. Springer Science & Business Media. ISBN 9783642259890. Retrieved 11 June 2019.
- Byron, Angela; Berry, Addison; Robbins, Jeff; Haug, Nathan; Berry, Heather; Eaton, Jeff; Walker, James (2009). Using Drupal. "O'Reilly Media, Inc.". ISBN 9780596515805. Retrieved 11 June 2019.
- "CKEditor Pricing". CKEditor Official Page.
- "CKEditor 3.0 is here!". 2009-08-21. Retrieved 2020-03-20.
- "CKEditor 5 v10.0.0 – the future of rich text editing looks stable". ckeditor.com. Retrieved 2018-05-07.
- "API documentation". Retrieved 4 August 2020.
- "CKEditor Ecosystem Documentation: Overview".
- "Letters - Overview". Retrieved 4 August 2020.
- "Bringing collaborative editing to any application". ckeditor.com. Retrieved 2017-11-23.
- "CKEditor Browser Compatibility". docs.cksource.com.
- "Browser compatibility". CKEditor 5 documentation. Retrieved 4 August 2020.
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